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Etymotic ER-20XS universal fit earplugs are the highly-awaited next generation of Etymotic's industry-leading ETY-Plugs High Fidelity Earplugs. They feature a stem-less design, with a low profile that conforms to the plane of the outer ear. This makes them particularly comfortable to wear under hats and other headgear. The universal fit version comes with three interchangeable pairs of eartips for more fitting options. Etymotic ER-20XS use a tuned resonator and acoustic resistor to replicate the natural response of the ear canal. This unique construction, combined with Etymotic’s proprietary sound path, reduces sound levels evenly across the frequency range without changing the sound quality. ER-20XS provide almost equal sound reduction of 20dB across the range of hearing. ER-20XS earplugs come with a small, flexible pull tab that allows for easy removal, an easy-to-install neck cord and a carrying case. ER-20XS eartips are interchangeable and it can also be used with foam eartips with essentially no change in response. Healthy hearing for a lifetime.